I have no idea what you are asking. What is the relation between いい香りがする and “I wanna have lunch at Wendy's today”?
– Tsuyoshi ItoFeb 10 '13 at 13:31

@Flaw: Are you talking about “…気がしない” (do not want to …)? If so, this usage is limited to the negative form.
– Tsuyoshi ItoFeb 10 '13 at 16:05

Apologies for the confusion. The way I understand it, the construction ~がする is used with intangible qualities the speaker wants something to have, like mentioned in the answer and the phrase 気がする, but it was never laid out in a concrete ways, with examples and such
– Roy FuentesFeb 11 '13 at 4:40

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“the construction ~がする is used with intangible qualities the speaker wants something to have, like mentioned in the answer”: The answer by Tim does not state that, and I do not think that …がする describes some qualities the speaker wants something to have. Therefore, I am afraid that you may be still misunderstanding something about …がする.
– Tsuyoshi ItoFeb 11 '13 at 12:10

1 Answer
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Like Tsuyoshi, I see no obvious connection between いい香りがする and “I wanna have lunch at Wendy's today”. I suspect you are confusing the expression 気がする with 気になる/気に入る but please clarify: it may be worthwhile sorting this out.

As for the use of する in 「いい香りがする」:

This is one of several uses of する not covered in the basic text books. In addition to its more conventional use (such as 日本語を勉強する), the verb する is also used in the following constructions to convey the following meanings:

１）To wear something, typically accessories such as マフラー, 腕時計 or ネクタイ.

eg ネックレスをする | to wear a necklace.

(する is functioning as a 他動詞/transitive verb taking を.）

2) To sense something such as におい、音、気、味

eg Nのにおいがする | to smell N

(Where する is functioning as a 自動詞/intransitive verb taking が.）

３） To cost an amount

eg 家賃が１０万円もする

(Where する is functioning as a 自動詞/intransitive verb which would normally take が but the amount works like adverb so が is omitted.）